How Important are High-Level ab initio Treatments for the Interaction Dipole Moment and Polarizability of Hene?

We report calculations of the interaction dipole moment and polarizability for the HeNe heterodiatom. Our results are extracted from finite-field Moller-Plesset perturbation theory and coupled cluster calculations with a large, flexible Gaussian-type basis set. At post-Hartree-Fock level, the interaction dipole moment is method-sensitive for relatively short internuclear separations R/a0 while the interaction polarizability becomes rapidly method-insensitive for R/a0 > 2.5.